How many hearts does an octopus have? The octopus has nine brains and three hearts. Octopuses have blue blood. This fact is more unknown than imagined. The octopus's central brain controls the nervous system. Each octopus has a brain in its arm. The octopus has two branched hearts that help pump blood with two gills. A bunch of brain neurons. In the three hearts of the octopus, a systemic heart is responsible for blood circulation in the body. see more Click this link

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